EP1677087A1 - Ensemble de thermocouples et un procédé d'utilisation - Google Patents

Ensemble de thermocouples et un procédé d'utilisation Download PDF

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Publication number
EP1677087A1
EP1677087A1 EP04447285A EP04447285A EP1677087A1 EP 1677087 A1 EP1677087 A1 EP 1677087A1 EP 04447285 A EP04447285 A EP 04447285A EP 04447285 A EP04447285 A EP 04447285A EP 1677087 A1 EP1677087 A1 EP 1677087A1
Authority
EP
European Patent Office
Prior art keywords
thermocouple
temperature
assembly according
junction
thermocouple assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04447285A
Other languages
German (de)
English (en)
Inventor
Bernard Robbins
David Farrell
David L. Rush
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vesuvius Crucible Co
Original Assignee
Vesuvius Crucible Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vesuvius Crucible Co filed Critical Vesuvius Crucible Co
Priority to EP04447285A priority Critical patent/EP1677087A1/fr
Priority to EP05850303A priority patent/EP1831660A2/fr
Priority to US11/793,877 priority patent/US20080175303A1/en
Priority to PCT/EP2005/013693 priority patent/WO2006066862A2/fr
Priority to CA002590298A priority patent/CA2590298A1/fr
Priority to ZA200705773A priority patent/ZA200705773B/xx
Priority to KR1020077016584A priority patent/KR20070090028A/ko
Priority to CNA2005800437582A priority patent/CN101084420A/zh
Priority to TW094145264A priority patent/TW200630600A/zh
Publication of EP1677087A1 publication Critical patent/EP1677087A1/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G01K7/04—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples the object to be measured not forming one of the thermoelectric materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
    • H10N10/80—Constructional details
    • H10N10/85—Thermoelectric active materials

Definitions

  • the present invention concerns a thermocouple assembly for the measurement of the temperature of a molten phase (or other high temperature applications) and to a method for the measurement of the temperature of a molten phase (or other high temperature applications) using the said thermocouple assembly.
  • thermocouple constituted of metals are known and largely used for decades. Unfortunately, the metals used for these thermocouple have a tendency to oxidise or to be chemically attacked during use so that their accuracy is not guaranteed over extended periods. It has already been described that certain non-metallic materials, for example ceramics, may also produce an electromotive force in relation to their temperature. Ceramics do not suffer the above disadvantages.
  • thermocouple assemblies for the measurement of the temperature of a molten phase and other high temperature applications. These thermocouple assemblies consist of first and second ceramic elements contacting each other at a junction wherein one of the ceramic elements is urged against the other.
  • thermocouple assembly for the measurement of a temperature comprising first and second ceramic elements contacting each other at a first junction and forming thereby a first thermocouple
  • this objective can be reached when the assembly also comprises a second thermocouple formed of two different conducting elements (generally metallic conductors) contacting each other at a second junction located on the first ceramic element and a third thermocouple formed of two different conducting elements (generally metallic conductors) contacting each other at a third junction located on the second ceramic element, wherein both positive legs or both negative legs of the second and third thermocouples are connected to a first measuring device, while both legs of the second and third thermocouple are connected respectively to a second and third measuring device.
  • the inventors have indeed realised that it is impossible to accurately compensate by electronic means only the electromotive forces generated at these cold junctions for a broad range of temperatures and have therefore decided to measure or calculate them exactly and then add or subtract these electromotive forces to calculate the true electromotive force at the hot junction.
  • the first measuring device is an electromotive force readout meter while the second and third measuring devices are thermocouple temperature measuring devices.
  • the electromotive forces generated at said cold junctions can be calculated by comparing the measured temperature values to experimental data (calibration curve) or theoretical data (polynomial curve).
  • the first, second and third measuring devices are electromotive force readout meters.
  • the second and third electromotive force readout meters comprise compensating means (for example electronic circuits) for these electromotive forces.
  • thermocouple As well as the connectors of their respective electromotive force readout meters are metallic conductors so that conventional cold junction compensating means can be used.
  • the first and second ceramic elements are selected from the group consisting of silicon carbide, titanium nitride, molybdenum disilicide, boron carbide, titanium dioxide, carbon and stabilised zirconia.
  • the first ceramic element comprises molybdenum disilicide and the second ceramic element comprises silicon carbide or titanium nitride.
  • the first ceramic element forms an inner leg or and the second ceramic element forms an outer sheath.
  • the second ceramic elements protects the first ceramic elements from attacks by the molten phase.
  • the second ceramic element is generally selected to be suitable to resist the molten phase attacks for a certain time.
  • the assembly preferably further comprises an electrically insulating sleeve (preferably constituted of alumina) around the inner leg. This provides electrical insulation and helps to provide rod retention and cushioning from vibration.
  • thermocouple assembly can itself be engaged into a ceramic protective sleeve, for example as described in US-A-4721533.
  • the invention relates to a method for the measurement of a temperature comprising
  • the total electromotive force read on the meter will be equal to the electromotive force generated at the first (hot) junction plus the electromotive force generated at the cold end of the first ceramic element (as calculated or measured using the second measuring device) minus the electromotive force generated at the cold end of the second ceramic element (as calculated or measured using the third measuring device).
  • the electromotive force generated at the first (hot) junction can thereby be easily assessed and converted into a temperature, for example by comparing this value with a calibration curve or a polynomial expression.
  • steps b) to d) will provide a continuous measurement of the temperature.
  • Fig.1 depicts a schematic thermocouple assembly according to the invention
  • Fig.2 is a diagram showing the temperature determinated with the thermocouple assembly of Fig. 1 using the above described method.
  • Fig. 1 schematically shows thus a thermocouple assembly for the measurement of the temperature of a molten phase according to the invention. It is constituted of first and second ceramic elements (1,2) contacting each other at a first junction (3) and forming thereby a first thermocouple. In use, the junction (3) is positioned at or under the level of the molten phase.
  • a second thermocouple formed of two different conducting elements (4,5), preferably metallic conductors, contacting each other at a second junction (6) is located on the first ceramic element (1) (preferably around the cold end of the first ceramic element (1)).
  • a third thermocouple formed of two different conducting elements (7,8), preferably metallic conductors, contacting each other at a third junction (9) is located on the second ceramic element (2), (preferably around the cold end of the second ceramic element (2)).
  • Both positive legs (4,7) or both negative legs (5,8) of the second and third thermocouples are connected to a first measuring device (10) (for example, an electromotive force readout meter).
  • Both legs (4,5;7,8) of the second and third thermocouple are connected respectively to a second and third measuring devices (11,12) (for example thermocouple temperature measuring devices).
  • the electromotive forces generated at the cold ends are precisely measured and can be taken into account when determining the true electromotive force generated at the hot junction (3).
  • the electromotive force generated at the hot junction can thereby be easily assessed and converted into a temperature, for example by comparing this value with a calibration curve or a polynomial expression.
  • such an installation can be achieved very simply by using both positive legs (4,7) or both negative legs (5,8) of the second and third thermocouples which are connected to a first electromotive force readout meter (10).
  • Fig. 2 Visible on Fig. 2 is a curve depicting the temperature measured in continuous with the thermocouple assembly according to the invention (continuous line) in a tundish used for the continuous casting of molten steel versus the casting time.
  • the thermocouple assembly was inserted into an alumina-graphite protective sleeve as described in US-A-4721533 and located near the stopper rod controlling the molten steel flow exiting from the tundish. At the beginning of the casting operations (opening of the ladle upstream the tundish), the temperature raises rapidly. The response time of the thermocouple assembly was considered excellent. After about 90 minutes, the temperature of the tundish was around 1450°C; this coincides with the end of the first ladle.
  • thermocouple assembly of the type ACCUMETRIX sold by VESUVIUS USA CORPORATION as disclosed in US-A-4721533 located at the opposite side of the tundish.
  • the temperatures measured with the ACCUMETRIX sensor are depicted as triangles on Fig. 2. It can be seen that the temperatures measured with both systems correspond perfectly all along the casting operations. After use, the thermocouple assembly according to the invention was inspected and no damages was observed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
EP04447285A 2004-12-21 2004-12-21 Ensemble de thermocouples et un procédé d'utilisation Withdrawn EP1677087A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP04447285A EP1677087A1 (fr) 2004-12-21 2004-12-21 Ensemble de thermocouples et un procédé d'utilisation
EP05850303A EP1831660A2 (fr) 2004-12-21 2005-12-20 Ensemble de thermocouples et un procédé d'utilisation
US11/793,877 US20080175303A1 (en) 2004-12-21 2005-12-20 Thermocouple Assembly And Method Of Use
PCT/EP2005/013693 WO2006066862A2 (fr) 2004-12-21 2005-12-20 Ensemble thermocouple et son procede d'utilisation
CA002590298A CA2590298A1 (fr) 2004-12-21 2005-12-20 Ensemble thermocouple et son procede d'utilisation
ZA200705773A ZA200705773B (en) 2004-12-21 2005-12-20 Thermocouple assembly and method of use
KR1020077016584A KR20070090028A (ko) 2004-12-21 2005-12-20 열전대 조립품 및 사용방법
CNA2005800437582A CN101084420A (zh) 2004-12-21 2005-12-20 热电偶组件及其使用方法
TW094145264A TW200630600A (en) 2004-12-21 2005-12-20 Thermocouple assembly and method of use

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04447285A EP1677087A1 (fr) 2004-12-21 2004-12-21 Ensemble de thermocouples et un procédé d'utilisation

Publications (1)

Publication Number Publication Date
EP1677087A1 true EP1677087A1 (fr) 2006-07-05

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP04447285A Withdrawn EP1677087A1 (fr) 2004-12-21 2004-12-21 Ensemble de thermocouples et un procédé d'utilisation
EP05850303A Withdrawn EP1831660A2 (fr) 2004-12-21 2005-12-20 Ensemble de thermocouples et un procédé d'utilisation

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP05850303A Withdrawn EP1831660A2 (fr) 2004-12-21 2005-12-20 Ensemble de thermocouples et un procédé d'utilisation

Country Status (8)

Country Link
US (1) US20080175303A1 (fr)
EP (2) EP1677087A1 (fr)
KR (1) KR20070090028A (fr)
CN (1) CN101084420A (fr)
CA (1) CA2590298A1 (fr)
TW (1) TW200630600A (fr)
WO (1) WO2006066862A2 (fr)
ZA (1) ZA200705773B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009050433B3 (de) * 2009-10-22 2010-10-07 Abb Ag Vorrichtung und Verfahren zur Kalibrierung von Temperaturfühlern

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2428517A (en) * 2005-07-21 2007-01-31 Weston Aerospace Ltd Ceramic thermocouple
US8047712B1 (en) * 2007-07-26 2011-11-01 Lockheed Martin Corporation Method and apparatus for predicting steady state temperature of solid state devices
US8821013B2 (en) * 2010-10-28 2014-09-02 Corning Incorporated Thermocouples with two tabs spaced apart along a transverse axis and methods
CN102095513B (zh) * 2011-01-27 2012-10-10 洛阳市西格马仪器制造有限公司 一种硼化物复合陶瓷温度传感器
DE102012003614B3 (de) * 2012-02-23 2013-05-29 Testo Ag Temperaturmessgerät, Temperaturmessgerät-Set und Verfahren zur Konfiguration eines mit einem Thermoelement betreibbaren Temperaturmessgeräts
CN102944321B (zh) * 2012-12-07 2014-07-16 重庆材料研究院 用于测量微距离温差的高精度厚膜型热电偶组的制备方法
CN103105241A (zh) * 2013-01-30 2013-05-15 上海安可泰环保科技有限公司 一种高电压环境下应用的热敏陶瓷温度传感装置
CN105716733B (zh) * 2016-01-29 2018-07-17 东南大学 一种火电机组套管式热电偶温度测量的动态校正方法
WO2018011971A1 (fr) * 2016-07-15 2018-01-18 宮川化成工業株式会社 Thermocouple
CN106768438B (zh) * 2016-11-18 2019-06-14 中国计量大学 一种热电偶测量端的制作方法
DE102020203166A1 (de) 2020-03-12 2021-09-16 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Sensoraufbau zur Bestimmung hoher Temperaturen und Verfahren zur Herstellung des Sensoraufbaus

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Publication number Priority date Publication date Assignee Title
GB815047A (en) * 1957-09-10 1959-06-17 Max Planck Inst Eisenforschung Improvements relating to thermocouples
US3085125A (en) * 1961-10-02 1963-04-09 Gen Motors Corp Thermocouple
GB2288908A (en) * 1994-04-27 1995-11-01 Rowan Technologies Ltd Ceramic thermocouple
US6239351B1 (en) * 1993-07-01 2001-05-29 Hoskins Manufacturing Company Multi-wire self-diagnostic thermocouple
EP1365219A2 (fr) * 2002-05-22 2003-11-26 Shin-Etsu Chemical Co., Ltd. Tube de protection pour thermocouple

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US2981775A (en) * 1958-11-12 1961-04-25 Steatite Res Corp Oxide thermocouple device
DE2016873A1 (de) * 1970-04-09 1971-10-21 Qualitats Und Edelstahl Kom Ve Differentialthermoelement zur indirek ten quantitativen Bestimmung einer Legie rungskomponente aus einer leitenden Schmel ze mit mehreren Legierungskomponenten
US4721533A (en) * 1986-08-01 1988-01-26 System Planning Corporation Protective structure for an immersion pyrometer
US5356485A (en) * 1992-04-29 1994-10-18 The United States Of America As Represented By The Secretary Of Commerce Intermetallic thermocouples
US5713668A (en) * 1996-08-23 1998-02-03 Accutru International Corporation Self-verifying temperature sensor
US6072165A (en) * 1999-07-01 2000-06-06 Thermo-Stone Usa, Llc Thin film metal/metal oxide thermocouple
DE10030354A1 (de) * 2000-06-21 2002-01-10 Bosch Gmbh Robert Thermoelektrisches Bauelement
FR2822295B1 (fr) * 2001-03-16 2004-06-25 Edouard Serras Generateur thermoelectrique a semi-conducteurs et ses procedes de fabrication
JP3828465B2 (ja) * 2002-07-23 2006-10-04 株式会社神戸製鋼所 高融点金属炭化物−炭素系材料熱電対形の温度測定装置及びその装置の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB815047A (en) * 1957-09-10 1959-06-17 Max Planck Inst Eisenforschung Improvements relating to thermocouples
US3085125A (en) * 1961-10-02 1963-04-09 Gen Motors Corp Thermocouple
US6239351B1 (en) * 1993-07-01 2001-05-29 Hoskins Manufacturing Company Multi-wire self-diagnostic thermocouple
GB2288908A (en) * 1994-04-27 1995-11-01 Rowan Technologies Ltd Ceramic thermocouple
EP1365219A2 (fr) * 2002-05-22 2003-11-26 Shin-Etsu Chemical Co., Ltd. Tube de protection pour thermocouple

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009050433B3 (de) * 2009-10-22 2010-10-07 Abb Ag Vorrichtung und Verfahren zur Kalibrierung von Temperaturfühlern

Also Published As

Publication number Publication date
EP1831660A2 (fr) 2007-09-12
WO2006066862A3 (fr) 2006-10-26
WO2006066862A2 (fr) 2006-06-29
US20080175303A1 (en) 2008-07-24
ZA200705773B (en) 2009-01-28
TW200630600A (en) 2006-09-01
CN101084420A (zh) 2007-12-05
CA2590298A1 (fr) 2006-06-29
KR20070090028A (ko) 2007-09-04

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